Sendmail + OpenDKIM?

Question

send mail

Good night, comrades,
I've been struggling with the Sendmail + OpenDKIM setup for an hour now, and still nothing. I don't know what to do anymore.

Mar  1 03:47:16 mta opendkim[4877]: r213lGZl004956: example.com [1.2.3.4] not internal
Mar  1 03:47:16 mta opendkim[4877]: r213lGZl004956: not authenticated
Mar  1 03:47:16 mta opendkim[4877]: r213lGZl004956: external host example.com attempted to send as example.com
Mar  1 03:47:16 mta sendmail[4956]: r213lGZl004956: milter=opendkim, action=eoh, continue
Mar  1 03:47:16 mta sendmail[4956]: r213lGZl004956: milter=opendkim, action=body, skip
Mar  1 03:47:16 mta opendkim[4877]: r213lGZl004956: no signature data
Mar  1 03:47:16 mta sendmail[4956]: r213lGZl004956: Milter accept: message

And the message headers are empty, there is no signature.
What does example.com [1.2.3.4] not internal mean? How is it that it is not internal? What to check, so that all this miracle would work?
Thanks

Answer 1

I figured it out!
The problem was that my host was not listed in InternalHosts
Very good tutorial here

Answer 2

Where are the OpenDkim and Sendmail configs?